Effect of water and fertilizer interaction on photosynthetic characteristics of winter wheat

Effect of water and fertilizer interaction on photosynthetic characteristics of wheat variety 3 279 was studied by pot cultivation under rainproof shelter with 7 water and fertilizer interaction treatments.The results showed that,under different treatments,the photosynthetic rate,the stomatal conductance and the intercellular CO_2 concentration of winter wheat were different,but there was a balance relation among these three characters.Deep fertilization could maintain a high photosynthetic rate in the late stage of wheat growing,but reduced the stomatal conductance and the water transpiration,being effective for water saving.Under the same water condition,compared to the treatment of irrigation under fertilizer,that above fertilizer was affected little by water and caused a rapid drop of chlorophyll content.Under the treatment of deep fertilization and irrigation at 20 cm,the photosynthetic rate of wheat after blooming was the highest,the stomatal conductance was low,and the intercellular CO_2 concentration was high,showing a considerable water-saving potential.